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From Sonic Retro

Shadow vs. the Biolizard in Cannon's Core.

The Biolizard, as seen in Sonic X's adaptation of the Sonic Adventure 2 storyline.

In Sonic Adventure 2, the Biolizard (code-named Project Shadow) was created by Professor Gerald Robotnik about fifty years before the game's storyline.

It was designed to be the ultimate life form. When GUN came to ARK, they found the Biolizard and shut it down. It didn't go without a fight however and it destroyed almost the entire group of GUN soldiers.

Based on the lessons learnt during Biolizard's creation, Gerald Robotnik wento on to create Shadow the Hedgehog. Shadow's last memory was that GUN attacked the space colony ARK and shooting Maria, killing her in the process. She sent him to Earth (Mobius in the Archie comic series) to make the people there happy.

Meanwhile, the Biolizard remained in suspended animation until Sonic the Hedgehog and his crew came to ARK. After Sonic stopped Eggman from destroying Earth a video of Prof. Gerald came online warning people of Shadow. Sonic and Eggman joined forces and helped to deactivate the Eclipse Cannon.

The Biolizard was awoken and pulled ARK into Earth's atmosphere causing it to fall. Amy Rose convinced Shadow to help save the Earth. He remembered Maria's wish and helped Sonic and Knuckles get to the Chaos Emeralds. Shadow fought the Biolizard only for it to use Chaos Control and fuse with ARK, becoming the Finalhazard. Using the Chaos Emeralds Sonic and Shadow became Super Sonic and Super Shadow and fought the Finalhazard. Using Finalhazard's wounds to hurt him Sonic and Shadow killed the Finalhazard and stopped ARK from crashing into Earth. Shadow is presumed to have lost his life in the process.